Qbinding-machine



C. E. VAN NORMAN.

GRINDING MACHINE.

APPLICATION man NOV. :3. I915 3 SHEETS-SHEET 1.

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C. E. VAN NORMAN.

GRlNDlNG MACHINE.

APPLICATION FILED Nov. 13. was.

Patented May 16, 1919.

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U A INVENTOR. [/QKQJfAZZA/JMZ; By E W I TNF SSES 6 M71. MM

A TTOR NE Y.

C. E. VAN NORMAN.

GRINDING MACHINE.

APPLICATION FILED nov. 13. 19:5.

Patented May 13,

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CHARLES E. VAN NORMAN, OF SPRINGFIELD, MASSACHUSETTS.

GBINDING-M-ACHINE.

Specification of Letters Patent.

Patented May 13, 1919.

Application filed November 13,-18-15. Serial 110.61389.

To all whom it may concern:

Be it known that I, CHARLES E. VAN NORMAN, a citizen of the United States of America, and residing in Springfield, in the county of Hampden and State of Massachusetts, have invented certain new and useful Improvements in Grinding-Machines, of which the followingis a specification.

This invention relates to improvements in grinding machines. In the specific form chosen to illustrate the.invention, it has to do with automatic grinding machines for internal and face grinding of aprecise character, such as are adapted for finishing bushings, ball races, the bores of gear wheels, and the like. A machine of this general type is disclosed in reissued Letters Patent No. 13,892, issued to me on March 16,1915.

The general type of machine which it is the object of this invention to improve comprises a rotatable support for the work to be ground, a rotatable grinding element, means to feed the grinding element transversely to the work, means to reciprocate the grinding element longitudinally with respect to the work in paths of variable lengths, and limited means to adjust the work support angularly and longitudinally with respect to the grinding element. In addition, an auxiliary quick-acting device is preferably provided, which is operable by hand to separate the work and the grinding element. This device permits a separation of the work from the grinding element to allow inspection, testing, and measurement of the work from time to timeduring the progress of the grindin The parts may be hand or automatical y operated so far as the broad invention is concerned.

In order to support the two vital elements of the machine, viz.the work-carrying head and the rotary tool-carrying spindle, and provide for the desired movements of One with respect to the other both during the grinding and inspecting operations, I have separatedthe slide for the one element from the slide for the other element and have provided a stable support for each which has its weight directly and vertically on the main frame. 7 Bythis se aration of the slides, I am enabled to provide a stable or solid support for each element and, at the same time, provide means to conveniently move one or both away from the grinding position. While this separation of theslides may be in a longitudinal direction, as lengthwise of the machine, I prefer to mount the work-carrying head on a slide arranged transversel of the machine. This arrangement results 1n a material savingof floor space. It isalso more convenient for the. work-carrying head can be moved from a position immediately over the main frame sidewise of the machine where the workman can face it directly without bending over and with an unimpeded path to test the'work and inspect it. In addition, by stopping the automatic longi tudinal feed of the grinding tool, a crossfeeding-of the work can be had by hand to grind the end face, for instance, of gear wheels, and the internal grinding can again be started for the setting of the automatic grinder feed need not be disturbed.

The delicate character and. extreme accuracy of the grinding required in modern grinding machines makes any improvement which results in better work either by proper supports for the. vital elements to eliminate vibration or otherwise of considerable importance.

An object of this invention is to provide a grinding machine having separate slides to carry the tool-holding spindle and the work-carrying head, each of which has a direct vertical support on the main frame. and means ope'rably independent of the normal feeding means to quickly move the work-carrying head or the tool-carrying spindle one into offset axial relation with respeet to the other.

Another object of the invention is-to provide a grinding machine having separate slides for the tool-holding spindle, and the work-carrying head, each of which has a direct vertical support on the main frame when the tool and work are in line and arranged transversely one to the other, and means to quickly move the slide with the work-carrying head to-one side of the main frame where the workman may squarely face the work to test and inspect it;

Another object of the invention isto provide a grinding. machine having two separately mounted slides, one longitudinal and: one transverse of the machineandione having thereon the work-carrying head and the other the tool-carrying spindle, and each arranged to have a direct vertical support on the main frame, the. transversely mounted slide having means to quickly more the element carried by it into offset relation.

Another object of the invention is to provide a grinding machine with a transversely arranged slide to more the work-carrying head, a longitudinally arranged slide for the tool-carrying spindle, and means to move it for automatic internal grinding, and means to accomplish face grinding by moving the work transversely of the tool-carrying spindle, said slides being arranged to hold the work-carrying head and tool-holding spindles 011 the main frame for direct vertical support dur' or the grinding operations, said last-mention d d means being constructed to move the work-carrying head sideWise of the machine for test and inspection without disturbing the setting of the first-mentioned means.

Other objects will appear in the detailed description and annexed claims.

One preferred embodiment of the invention, for the purpose of showing one way in which my invention may be carried out, is illustrated in the accompanying drawings in which Figure l is a front elevational view of the improved grinding machine;

Fig. 2 is an elevation of the left-hand end of the machine shown in Fig. 1;

Fig. 3 is a partial plan view on a larger scale showing the work and the grinder in cooperative relation;

Fig. 1 is a view similar to Fig. 3 show ing the work removed from the grinder to permit testing, measurement, and inspection;

Fig. 5 is a cross-sectional view taken on the line 55 of Fig. 3 looking in the direction of the arrows;

Fig. 6 is an elevational view of a portion of the right-hand end of the machine shown in Fig. 1 showing the work removed from the grinder;

Fig. 7 is a sectional view with parts broken away, taken on the line 77 of Fig. 3 looking in the direction of the .arrows; and

Fig. 8 is a sectional plan view taken on the line 8-8 of Fig. 5 looking in the direction of the arrows.

Referring to the drawings in detail: A represents the main frame of the machine. Formed on the upper right-hand end of the frame A are suitable guides or ways 13 (see Fig. 6) upon which a carriage 12 is slidably mounted. The carriage 12 is adapted to be reciprocated longitudinally along the Ways 13 by mechanism not shown but clearly disclosed in my prior patent alluded to above or by other equivalent mechanism. Formed on the carriage 12 and in a direction transverse to the travel thereof are other ways 15 (see Figs. 1.3, and 4) upon which a carriage 14 is slidable. The latter carries the grinding tool 16, which is rotatably mounted therein and adapted to be driven b the belt and pulle connections clearly s own in Figs. 1 an 6.

The carriage 14 is arranged to move by small increments along the transversely located ways 15 by mechanism which operates periodically and automatically at the end of each longitudinal reciprocation of the carriage 12. This mechanism is completely disclosed in my prior patent, above cited, and has been merely indicated on the drawings. For th present purposes, the following brief description will sufiice. Slidably mounted in the frame A is a. rod 18 (see Fig. 6), which is actuated by means not shown to periodically raise a plate 19 pivoted to the frame A. Restin upon this plate is a rod 20 which is adapte to raise a pawl 21, which rests upon the periphery of and turns a ratchet wheel 22. The rotative movements of the latter are transferred to a gear 23 which operates by a. lead screw to move the carriage 14 in a well-known manner. Hand operation of this carriage 1 1 is permitted by the crank-handle 24. The mechanism within the frame A for moving the carriages 12 and 14, as described, is operabl T driven (by means not shown) from the pn ley 26.

17 represents a handle, which is arranged, when turned, to retract the carriage 12 in a longitudinal direction. The manner in which this member operates is clearly shown and described in my prior patent cited above. By means of this handle and the mechanism operable thereby, the grinding tool 16 and carriages 12 and 14 may be quickly removed from the work to be ground. It is to be noted, however, that this mechanism, as disclosed in my previous patent, is operable only by disconnecting the mechanism for reciprocating the carriage 12 longitudinally of the machine.

Referring more particularly to Figs. 3 to 8, 6 represents a plate or bracket, which is bolted to the frame A. This member 6 is formed with a V-shaped groove 31 and a flat bearing surface 32 arranged transversely with respect to the travel of the carriage 12.

Slidably mounted on the surface 32 and the groove 31 is a carriage 1. Formed transversely on the latter are a pair of T-slots 30 which are arranged to receive T headed bolts 27 (see Fig. 7). A plate 2 is secured to the carriage 1 by these bolts in a manner to permit limited longitudinal adjustment. Formed in the plate 2 is a circular T-slot 29 and resting therein are T-headed bolts 28 which secure a head 3 to the plate and permit angular adjustment of the head. The head 3 rotatably supports a chuck 24, which carries a piece 25 to be ground, and the chuck is driven by the belt and pulley, clearly shown in the drawings.

Formed in the bracket 6 near one end thereof is a rectangular opening 33 and mounted therein and secured to the bracket is a racks (seeFigs. 5 and 8); In mesh with the rack 5 is a gear 4, fixed to a vertical spindle 7 ,which is rotatably supported in the carriage 1. Fixed to the upper portion of the spindle 7 is a handle 8 which, when turned from the position shown in Fig. 3 to that shown in Fig. 4, moves the carriage 1 and the work-carrying head 3 into axially offset relation with respect to the grinding element 16. Pivotally mounted on the handle 8 is a bent lever 9 which has one end formed with a latch. The latter is adapted to engage an adjustable stop 10 to lock the carriage 1 in proper position with the grinder 16 for the grinding operation. Ad ustabIe stops 11, mounted at either end of the carriage 1, are arranged to abut the end faces of thebracket 6 to limit the movement of the carriage in each direction.

It is to be noted the parts of the machine are so arranged that, when the work-carrying head 3 is properly positioned for grinding, a firm and irect vertical support for both the grinder and the Work-supporting head is provided. This will be apparent from an inspection of Fig. 1 and the two end views shownin Figs. 2 and 6, from which it will be seen that the frame A directly underlies both the Work-supporting head 3 and the grinder carriage 14. Thus, a direct vertical support is provided, which eliminates vibration in both the grinder 16 and the chuckhead 24 when the grinding spindle is operating at the very high speeds necessary, and in addition the work to be inspected is accessible when desired in a more convenient manner than heretofore. The arrangement of the parts substantially as described results in a saving in floor space, and in this respect as well as others is referable to a longitudinal separation 0 the slides.

When the chuck 24: and head 3 are in proper grinding position, the latch 9 engages the stop 10 and locks carriage 1 in position. The longitudinal feed for the carriage 12 is then adjusted, as disclosed in my prior atent, to cause the carriage 1 and the grin ing tool 16 to reciprocate in a path slightly greater in length than the article to be ground. The automatic transverse feed for the carriage 14 is also adjusted to feed the latter by the desired increments at the end of each reciprocation of the carriage 12. Thus, the work 25 may be ground in an automatic manner which is preferable but not necessary as the broad invention is applicable to a machine which is not automatic.

By disconnecting the automatic longitudinal and transverse feeds of the slides 12 and 14, the face of the work 25 can be ground by hand movement of the slide 1, and, if desired, the internal grinding may be later continued for the setting of the automatic feeds need not be disturbed while the face grinding is accomplished.

By releasing the latch 9 from the stop 10, the handle 8 may be turned through substantially 180 degrees which will remove the chuck 24 transversely away from the grinding element. When the handle is turned back to its original position so that the latch 9 again locks on the stop 10, the grinding may be resumed without any ad uStment whatever of the feeding mechanism. Since the chuck 24' is removed in a direction transverse to the travel of the carriage 12, the work 25 is brought to a position in which the workman can face it in the most convenient position for purposes of measurement. This will be apparent from Fig. 6, where it will be seen that an unimpeded path in the direction of the aXis of the work 25 is provided whereby calipers, standard plug gages, and the like may be conveniently applied to the work.

It is recognized that various changes may be made in the specific structure already described without departing from the scope of my invention which is defined in the appended claims.

hat I claim is 1. A grinding machine, comprising. a main frame, two separate slides mounted thereon, a tool-holding spindle 011 one slide and a work-carrying head on the other, slowacting cross-feeding mechanism for the toolcarrying slide, and quick-acting means to move the work-carrying slide to bring the work and the tool into olfSet relation.

2. A grinding machine comprising a body. a spindle carrying a rotary tool, a base slide movable on the body along the line of the spindle axis, a sub-slide by which the tool spindle is carried slidabl transversely of the base slide, feed mechanism coasting with said slides for imparting feed motion to the sub-slide, a work head mounted on a slide on the body having ways fixed transversely of the movement of said base slide, means for imparting quick-acting movement to the work head slide for the purpose of bringing the work head into offset relation to the tool spindle for the test and inspection of work, and means for relocating and securing the work head in correct operating position.

3. A grinding machine, comprising, a body, a spindle carrying a rotary tool, a base slide movable on the body along the line of the spindle axis, a sub-slide by which the tool spindle is carried slidable transversely of the base slide, feed mechanism coacting with said slides for imparting feed motion to the sub-slide, a cross-slide mounted transversely of the movement of said base slide, a work head mounted on said crossslide, adjustable means for positioning the head transversely of the movement of the cross-slide, means for imparting quick-acting movement to the work head slide for the purpose of bringing the work head into offset relation to the tool spindle for the test and inspection of work, and means for relocating and securing the work head in correct operating position. i

4. The combination in a grinding machine having arotatable rinding element, and slow acting automatic means to feed the same longitudinally and transversel to the work to be ground, a rotatable wor -carrying-head, and quick acting means to separate said head and said element in a direction transverse to the axes thereof, said means operable independently of and without disturbing the adjustment of said feeding means.

5. The combination in a grinding machine having a rotatable grinding element and. means to feed the same longitudinally and. transversely to the work to be ground, a rotatable work-carrying-head, means to separate said head and said element in a direction transverse to the axes thereof, said means operable independently of and without disturbing the adjustment of said feeding means, and means to position and hold said head accurately in cooperative relation with said grinding element.

6. A grindlng machine, comprising, a main frame, two separate slides mounted thereon, a tool-holding-spindle on one slide and a work-carrying-head on the other, slow-actin cross feeding means for the tool holding spindle slide, means to adjust the work-carrying-head angnlarly and crosswise of its slide, stops to limit the movement of the lastnamed slide on the main frame, and quick acting means to move said slide with the work-can'ying-head between the stops both away from and into line with the tool-carrying-spindle.

In an automatic grinding machine, a bed having longitudinal ways, a slide automatically reciprocable along the latter, a tool-carr in spindle mounted to move on said sli e ut always directly overlying said bed, slow-acting cross-feed mechanism to automatically move said spindle on its slide, a second bed adjacent one end of the first-named bed, a slide movable on the second bed transversely to the first-named slide, a work-carrying head on the second slide, means normally holding the latter to its bed with the work-carrying head in grinding position, and quick-acting means to release the last-named means and move the second slide and carry said head transversely beyond the first-named bed.

8. A grinding machine comprising a body, a spindle carrying a rotary tool, a base slide movable on the body along the line of the spindle axis, a sub-slide by which the tool spindle is carried slidable transversely of the base slide, feed mechanism coacting with said slides for imparting feed motion to the sub-slide, a work head mounted on a slide on the body having ways fixed transversely of the movement of the said base slide, means for imparting automatic movement to the base slide and to the feed mechanism of the sub-slide, and means for imparting quick acting movement by hand to the work head slide for the purpose of bringing the work head into offset relation to the tool spindle for the test and inspection of work.

CHARLES E. VAN NORMAN.

Copies of this patent may be obtained for in cents each, by addressing the Commissioner of Patents, Washington, D. 0." 

